// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_FORMATS_MP2T_ES_PARSER_MPEG1AUDIO_H_
#define MEDIA_FORMATS_MP2T_ES_PARSER_MPEG1AUDIO_H_

#include <stdint.h>

#include <list>
#include <memory>
#include <utility>

#include "base/callback.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/time/time.h"
#include "media/base/audio_decoder_config.h"
#include "media/base/media_export.h"
#include "media/base/media_log.h"
#include "media/formats/mp2t/es_parser.h"

namespace media {
class AudioTimestampHelper;
}

namespace media {
namespace mp2t {

    class MEDIA_EXPORT EsParserMpeg1Audio : public EsParser {
    public:
        typedef base::Callback<void(const AudioDecoderConfig&)> NewAudioConfigCB;

        EsParserMpeg1Audio(const NewAudioConfigCB& new_audio_config_cb,
            const EmitBufferCB& emit_buffer_cb,
            const scoped_refptr<MediaLog>& media_log);
        ~EsParserMpeg1Audio() override;

        // EsParser implementation.
        void Flush() override;

    private:
        // Used to link a PTS with a byte position in the ES stream.
        typedef std::pair<int64_t, base::TimeDelta> EsPts;
        typedef std::list<EsPts> EsPtsList;

        struct Mpeg1AudioFrame;

        // EsParser implementation.
        bool ParseFromEsQueue() override;
        void ResetInternal() override;

        // Synchronize the stream on a Mpeg1 audio syncword (consuming bytes from
        // |es_queue_| if needed).
        // Returns true when a full Mpeg1 audio frame has been found: in that case
        // |mpeg1audio_frame| structure is filled up accordingly.
        // Returns false otherwise (no Mpeg1 audio syncword found or partial Mpeg1
        // audio frame).
        bool LookForMpeg1AudioFrame(Mpeg1AudioFrame* mpeg1audio_frame);

        // Signal any audio configuration change (if any).
        // Return false if the current audio config is not
        // a supported Mpeg1 audio config.
        bool UpdateAudioConfiguration(const uint8_t* mpeg1audio_header);

        void SkipMpeg1AudioFrame(const Mpeg1AudioFrame& mpeg1audio_frame);

        scoped_refptr<MediaLog> media_log_;

        // Callbacks:
        // - to signal a new audio configuration,
        // - to send ES buffers.
        NewAudioConfigCB new_audio_config_cb_;
        EmitBufferCB emit_buffer_cb_;

        // Interpolated PTS for frames that don't have one.
        std::unique_ptr<AudioTimestampHelper> audio_timestamp_helper_;

        // Last audio config.
        AudioDecoderConfig last_audio_decoder_config_;

        DISALLOW_COPY_AND_ASSIGN(EsParserMpeg1Audio);
    };

} // namespace mp2t
} // namespace media

#endif // MEDIA_FORMATS_MP2T_ES_PARSER_MPEG1AUDIO_H_
